X-Git-Url: https://zdv.bktei.com/gitweb/EVA-2020-02.git/blobdiff_plain/fffd9f66c38b8ea6e04148329e4cba0f169a4031..fdeabe6f36d27958decaad834352b63c56b17817:/doc/time/README.org?ds=sidebyside diff --git a/doc/time/README.org b/doc/time/README.org index 5351973..e0cb102 100644 --- a/doc/time/README.org +++ b/doc/time/README.org @@ -5,15 +5,15 @@ ** About This document was created by Steven Baltakatei Sandoval on ~2020-07-23T22:27Z~ under a [[https://creativecommons.org/licenses/by-sa/4.0/][Creative Commons BY-SA 4.0 license]]. It was -updated by Steven Baltakatei Sandoval on ~2020-10-18T00:11Z~ +updated by Steven Baltakatei Sandoval on ~2021-01-25T00:32Z~. ** Narrative The ~ninfacyzga-01~ device is equipped with an Ozzmaker BerryGPS-IMU -module which provides time and location data to ~gpsd~ and ~chrony~. The -time is provided by GPS satellites which themselves are +module which provides time and location data to ~gpsd~ and +~chrony~. The time is provided by GPS satellites which themselves are equipped [fn:nasa_20020408_atomicclock] with atomic clocks. This -extremely accurate set of clocks are needed since a GPS receiver -calculates its position in space using a General Relativity +extremely accurate set of clocks is needed since a GPS receiver +determines its position in space using a [[https://en.wikipedia.org/wiki/Error_analysis_for_the_Global_Positioning_System#Special_and_general_relativity][General Relativity]] calculation that uses the small variations in the time stamps received from each satellite. This means that ~gpsd~ may be used to set the system clock without a need for an internet connection to a default @@ -46,6 +46,7 @@ Ozzmaker BerryGPS-IMU, Version 3 (see [[https://ozzmaker.com/berrygps-berrygps-i *** Initial Startup **** Perform initial setup. See [[file:../setup/README.org][Main Setup]] procedure. + **** Install Hardware for time tracking See [[https://ozzmaker.com/forums/topic/connecting-gps-pps-pin/][this]] Ozzmaker forum topic about connecting the BerryGPS-IMU ~T_PULSE~ pin to GPIO 18.